New p- and n-type skutterudites with ZT > 1 and nearly identical thermal expansion and mechanical properties

Autor(en)

Gerda Rogl, Andrij Grytsiv, Esmaeil Royanian, P. Heinrich, Ernst Bauer, Peter Franz Rogl, Michael Zehetbauer, Stephan Puchegger, Marius Reinecker, Wilfried Schranz

Abstrakt

Using thermoelectricity to directly convert (waste) heat energy into useful electricity faces a number of challenges. Not only are optimised thermal and electrical transport properties required resulting in a high figure of merit ZT and a high thermal electric conversion efficiency eta over a wide temperature range, thermoelectric (TE) materials must have sufficient mechanical integrity to survive continuous heating cooling cycles. Thermal expansion of the material as well as the mechanical properties play an important role, i.e. their values should be as similar as possible for p- and n-type alloys to avoid stresses when used in a TE device. In this paper multiple filled p- and n-type skutterudites (Ba,Sr,DD,Yb)(y)(Fe1-xNix)(4)Sb-12 with a ZT > 1 and eta approximate to 13% are presented, for the first time showing, in contrast to hitherto investigated skutterudites, nearly identical thermal expansion coefficients and elastic moduli. The ZT values of these skutterudites could be further enhanced by more than 20% after severe plastic deformation via high-pressure torsion.

Organisation(en)

Institut für Physikalische Chemie, Physik Nanostrukturierter Materialien, Fakultätszentrum für Nanostrukturforschung, Physik Funktioneller Materialien

Externe Organisation(en)

Technische Universität Wien

Journal

Acta Materialia

Band

61

Seiten

4066-4079

Anzahl der Seiten

14

ISSN

1359-6454

DOI

https://doi.org/10.1016/j.actamat.2013.03.031

Publikationsdatum

2013

Peer-reviewed

Ja

ÖFOS 2012

104017 Physikalische Chemie, 210006 Nanotechnologie, 104011 Materialchemie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/2a5b9c57-5df8-4b26-b61c-71126ce18ca4